Whoops sorry, it's even in the thread title

It's been a long day and I confused this with another thread!!

13.6 sounds spot on, that's stock boost give or take.

If you were to improve the intake cooling

(better intercooler or chargecooler, that type of thing) you can up the boost to about 16psi.

I'd keep it stock without supporting modifications though.

Out of interest what was wrong?